diff --git a/src/pipewire/client.c b/src/pipewire/client.c
index 4c647fe2a..ef2197c92 100644
--- a/src/pipewire/client.c
+++ b/src/pipewire/client.c
@@ -215,6 +215,9 @@ int pw_client_register(struct pw_client *client,
 {
 	struct pw_core *core = client->core;
 
+	if (client->registered)
+		return -EEXIST;
+
 	pw_log_debug("client %p: register parent %d", client, parent ? parent->id : SPA_ID_INVALID);
 
 	spa_list_append(&core->client_list, &client->link);
diff --git a/src/pipewire/factory.c b/src/pipewire/factory.c
index fb611eef1..489b7659a 100644
--- a/src/pipewire/factory.c
+++ b/src/pipewire/factory.c
@@ -142,6 +142,9 @@ int pw_factory_register(struct pw_factory *factory,
 {
 	struct pw_core *core = factory->core;
 
+	if (factory->registered)
+		return -EEXIST;
+
 	if (properties == NULL)
 		properties = pw_properties_new(NULL, NULL);
 	if (properties == NULL)
diff --git a/src/pipewire/link.c b/src/pipewire/link.c
index 9b33c1606..1a37d5cee 100644
--- a/src/pipewire/link.c
+++ b/src/pipewire/link.c
@@ -1280,6 +1280,9 @@ int pw_link_register(struct pw_link *link,
 	struct pw_core *core = link->core;
 	struct pw_node *input_node, *output_node;
 
+	if (link->registered)
+		return -EEXIST;
+
 	if (properties == NULL)
 		properties = pw_properties_new(NULL, NULL);
 	if (properties == NULL)
diff --git a/src/pipewire/port.c b/src/pipewire/port.c
index 7d480a82a..49e55a6d5 100644
--- a/src/pipewire/port.c
+++ b/src/pipewire/port.c
@@ -426,6 +426,9 @@ int pw_port_add(struct pw_port *port, struct pw_node *node)
 	struct pw_type *t = &core->type;
 	const char *str, *dir;
 
+	if (port->node != NULL)
+		return -EEXIST;
+
 	port->node = node;
 
 	spa_node_port_get_info(node->node,
@@ -537,6 +540,7 @@ static void pw_port_remove(struct pw_port *port)
 	}
 	spa_list_remove(&port->link);
 	pw_node_events_port_removed(node, port);
+	port->node = NULL;
 }
 
 void pw_port_destroy(struct pw_port *port)